"It’s much, much easier for the server to just split the check evenly. Don’t be an asshole."
"I didn’t order any alcohol, I shouldn’t have to pay as much."
“We’re all adults with jobs, let’s just make this simple, why are you being so uncouth and cheap?”
"What?! I ordered the cheapest thing on the menu, and you got the lobster-stuffed lobster burger with a side of gold-plated truffles! Also, what does uncouth mean?"
As you peel the layers of argument off the core issue here (that issue being, money), per usual, every pro is trailed by a con, and every answer unleashes another Kraken-sized quandary. But let’s do our best to chisel away at some common threads, starting with the big floppy etiquette elephant:
It is (obviously) much easier for servers to split the checks evenly, and even easier to not split at all.